2 * This file is part of stability-monitor-kmod-rpi3
4 * Copyright © 2019 Samsung Electronics
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation; either version 2 of
9 * the License, or (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see http://www.gnu.org/licenses/
20 #include <linux/module.h>
21 #include <linux/moduleparam.h>
22 #include <linux/init.h>
23 #include <linux/kernel.h>
26 #include <linux/proc_fs.h>
27 #include <linux/seq_file.h>
28 #include <linux/sched.h>
29 #include <linux/sched/signal.h>
30 #include <linux/sched/cputime.h>
32 #include <linux/pid_namespace.h>
33 #include <asm/uaccess.h>
34 #include <linux/time.h>
35 #include <linux/posix-timers.h>
36 #include <linux/kernel_stat.h>
37 #include <linux/fdtable.h>
38 #include <linux/math64.h>
39 #include <linux/task_io_accounting_ops.h>
40 #include <linux/security.h>
43 #define PAGE_TO_KB(x) ((x) << (PAGE_SHIFT - 10))
45 static struct proc_dir_entry* proc_file;
46 static char *blacklist[10] = {0, };
47 static int blacklist_c = 0;
49 module_param_array(blacklist, charp, &blacklist_c, 0000);
51 static u64 time_now(void)
53 return div64_ul(ktime_get_boot_ns(), NSEC_PER_USEC);
56 static inline u64 cputime_to_usecs(const u64 cputime)
58 // return cputime >> 12;
59 return div64_ul(cputime, NSEC_PER_USEC);
62 static unsigned int count_open_files(struct files_struct *files)
64 unsigned int open_files = 0;
71 spin_lock(&files->file_lock);
72 fdt = files_fdtable(files);
74 /* Find the last non zero cell in open fds array */
75 for (i = fdt->max_fds / BITS_PER_LONG - 1; i >= 0; i--) {
81 for (i = (i + 1) * BITS_PER_LONG - 1; i >= 0; i--) {
82 if(test_bit(i, fdt->open_fds))
86 spin_unlock(&files->file_lock);
90 static int stability_monitor_show(struct seq_file *m, void *v)
93 struct task_struct *task, *t;
94 struct pid *pid = NULL;
96 u64 uptime, utime, stime, ut, st;
97 unsigned long long vm_rss, total_ram;
98 struct task_io_accounting task_ioac;
99 unsigned int open_fds;
113 total_ram = PAGE_TO_KB(info.totalram);
115 seq_put_decimal_ull(m, "", uptime);
116 seq_put_decimal_ull(m, " ", total_ram);
119 for_each_process(task) {
120 ppid = task->real_parent->pid;
121 pid = task_pgrp(task);
132 if (task->flags & (PF_DUMPCORE|PF_SIGNALED|PF_EXITING)) {
137 security_cred_getsecid(((struct cred *)task->real_cred), &secid);
138 if (!security_secid_to_secctx(secid, &label, &label_len)) {
140 for (i = 0; i < blacklist_c; i++) {
141 if (strcmp(label, blacklist[i]) == 0) {
153 vm_rss = get_mm_rss(task->mm);
156 open_fds = count_open_files(task->files);
158 /* CPU time + IO accounting */
159 task_cputime_adjusted(task, &utime, &stime);
160 task_ioac = task->ioac;
162 while_each_thread(task, t) {
163 task_cputime_adjusted(t, &ut, &st);
166 task_io_accounting_add(&task_ioac, &t->ioac);
171 seq_put_decimal_ll(m, "", task->pid);
172 seq_put_decimal_ll(m, " ", ppid);
173 seq_put_decimal_ull(m, " ", cputime_to_usecs(utime + stime));
174 seq_put_decimal_ull(m, " ", PAGE_TO_KB(vm_rss));
175 seq_put_decimal_ll(m, " ", open_fds);
176 seq_put_decimal_ull(m, " ", task_ioac.read_bytes + task_ioac.write_bytes);
183 printk(KERN_DEBUG "stability_monitor_show() took %llu us\n", time_now() - uptime);
189 static int stability_monitor_open(struct inode *inode, struct file *file)
191 return single_open_size(file, stability_monitor_show, NULL, 8192);
194 static const struct file_operations stability_monitor_fops = {
195 .owner = THIS_MODULE,
196 .open = stability_monitor_open,
199 .release = single_release,
202 static int __init stability_monitor_init(void)
204 proc_file = proc_create("tsm", 0, NULL, &stability_monitor_fops);
211 static void __exit stability_monitor_exit(void)
213 remove_proc_entry("tsm", NULL);
216 module_init(stability_monitor_init);
217 module_exit(stability_monitor_exit);
219 MODULE_LICENSE("GPL");